[Bug Report] n_coop attribute doesn't seem to have any effect

[marimeireles]

Describe the bug

When using the n_coop attribute in the Waterworld game one is supposed to see a clustering of "n" pursuers to be able to catch an evader.
What I'm seeing with the code example that I'll post next is that even with n_coop=2 one lonely pursuer can still catch an evader.

Code example

from pettingzoo.sisl import waterworld_v4
env = waterworld_v4.env(render_mode='human', n_coop=2, n_pursuers=4)

env.reset()
for agent in env.agent_iter():
    observation, reward, termination, truncation, info = env.last()

    if termination or truncation:
        action = None
    else:
        action = env.action_space(agent).sample() # this is where you would insert your policy

    env.step(action)
env.close()

System info

Pettingzoo version == master
Built from source

Additional context

No response

Checklist

• I have checked that there is no similar issue in the repo

[dm-ackerman]

There is a bug in waterworld related to multiple pursuers. I have a fixed version locally but I haven't had a chance to push it yet. I'll try to do that this week. It may fix the behaviour you are seeing.

[elliottower]

Appreciate the help guys, will take a look and try to get these things merged as soon as possible.

[marimeireles]

Hey @dm-ackerman that's cool!
I'll be happy to help you merge by fixing any compatibility issues, if you're interested in just submitting your PR.
Thanks Elliot! :)

[jkterry1]

Hey guys,

Is this bug still live, or was a PR for this created?